Amazon has removed at least two listings for books containing nonscientific “cures” for autism, including drinking and bathing in a bleach-like substance and ingesting a drug used to treat lead poisoning.

Healing the Symptoms Known as Autism and Fight Autism and Win, both previously on sale through the retail giant, were not available on Wednesday.

The move comes around two weeks after Rep. Adam Schiff (D-Calif.) sent a letter to Amazon founder Jeff Bezos scolding him for doing little to combat some parents’ belief that vaccines cause autism. Schiff accused Amazon of “surfacing and recommending products and content that discourage parents from vaccinating their children,” and urged Bezos to find a way to “distinguish quality information from misinformation or misleading information.”

Healing the Symptoms Known as Autism recommends that children with autism drink and bathe in chlorine dioxide, sometimes called a “Miracle Mineral Solution.” It is commonly used as an industrial cleaning agent that can cause dehydration and nausea if ingested. Fight Autism and Win instructs parents to give autistic children repeated doses of DMSA, a drug used to treat lead poisoning but that the FDA cautions can be dangerous if not taken under medical supervision.

The Miracle Mineral Supplement of the 21st Century, used as a general example of the type of medical misinformation available on Amazon, alleged that chlorine dioxide could cure everything from malaria to cancer.

While there are accepted medical treatment options for autism, there is no known cure. Researchers have repeatedly disproven any link between childhood vaccinations and the onset of autism. In 2010, the journal The Lancet retracted a widely criticized study that it had published in 1998 and which vaccine opponents had used to prove their fears were justified.

Although it remains a hugely popular bookseller, Amazon does not appear to have strict rules in place to prevent sellers from using its platform to spread medically dangerous information.

Wired UK writer Matt Reynolds explained how remarkably easy it was to list a book on the site. When Reynolds created a fake Kindle book titled How to Cure Autism: A Guide to Using Chlorine Dioxide to Cure Autism, the fabricated volume was approved for sale “within two hours.” The site’s Kindle publishing service even suggested a stock image showing a red “approved” stamp over the letters “FDA.”